Nesting Box Calculator
Tells you how many nesting boxes your hens need and the size to build each one.
- Nesting boxes needed
- 2
- one box per 4 hens, rounded up
- Box size
- 12 × 12 × 12 in
- width × height × depth
What a typical flock needs
For 6 laying hens you need 2 nesting boxes, each about 12 × 12 × 12 inches. That's it — this is the simplest calculation on the site, and also the one keepers most often overbuild.
How this calculation works
The rate is one box per 4 hens, rounded up — University of Minnesota Extension's recommendation (Virginia Cooperative Extension allows one per 4–5). Rounding up means 5 hens get 2 boxes and 13 hens get 4. A single hen still gets one box, because zero isn't an option she'll accept.
Why so few? Hens don't want a private box each — they want the proven spot. Laying is socially cued: the box where eggs already are (or where the boss hen lays) reads as predator-tested and safe, so your six hens will queue for one favorite while identical boxes sit empty. Extra boxes don't relieve the queue; they just become sleeping quarters, and box-sleepers mean manure-covered eggs.
The 12 × 12 × 12 inch dimension suits standard breeds — big enough to turn around in, snug enough to feel like a hideout. Go 14 inches for Brahmas and Jersey Giants, 10 for bantams. Mount boxes 18–24 inches off the floor, in the darkest corner of the coop, and — the rule that matters most — lower than your roosts, or the flock will sleep in them.
A worked example
A 10-hen flock: 10 ÷ 4 = 2.5, rounded up to 3 boxes. Built as one bank of three 12-inch cubbies, that's a 36-inch shelf — about one sheet-scrap of plywood and an afternoon. Add a 4-inch lip on the front edge so eggs and bedding stay in, slope the roof so nobody roosts on top, and line each box with 2–3 inches of pine shavings. If you later grow the flock to 13, the same math says build one more box.
Collecting eggs and finding them dirty, broken, or eaten? The fix is almost never more boxes. Dirty eggs mean birds sleeping in boxes (raise your roosts above them); broken eggs mean thin bedding or a too-big box shared by two hens; missing eggs mean a hidden nest outside or an egg-eater who needs catching early. The box count from this calculator is a floor space problem solved — those are management problems.
Frequently asked questions
- How many nesting boxes do I need per hen?
- One box per 4 hens, rounded up (University of Minnesota Extension; Virginia Cooperative Extension says one per 4–5). Six hens need 2 boxes, twelve need 3. Hens happily share — building a box per bird just gives them more places to sleep and poop.
- What size should a nesting box be?
- The standard is 12 × 12 × 12 inches for standard-size hens (University of Minnesota Extension). Heavy breeds like Brahmas appreciate 14 inches; bantams manage with 10. Bigger isn’t better — hens prefer a snug, dim cubby, and oversized boxes invite two hens to crowd in and break eggs.
- Where should nesting boxes go in the coop?
- The quietest, darkest corner of the coop, raised 18–24 inches off the floor — and always lower than the roosts. Chickens sleep on the highest available perch; if the boxes sit above the roosts, they’ll sleep in the boxes and you’ll collect filthy eggs every morning.
- Why are all my hens fighting over one box?
- Completely normal. Hens follow each other’s cues about where it’s safe to lay, so a favorite box develops a queue while identical boxes sit empty. As long as you have one box per 4 hens, the squabbling is theater, not a housing problem.
- What’s the best bedding for nesting boxes?
- Pine shavings are the default: cheap, absorbent, and easy to refresh. Straw works but mats down and hides mites; hay molds when damp. Whatever you use, keep it 2–3 inches deep so eggs don’t crack on the floor, and refresh it whenever it looks dirty — dirty boxes mean dirty eggs.